Hoisting and lowering mechanism for boats.



No. 798,973. PATENTED SEPT. 5, 1905. F. S. PETT.

HOISTING AND LOWBRING MECHANISM FOR BOATS.

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N0. 798,973. PATBNTED SEPT. 5, 1905. F. S. PETT.

HOISTING AND LOWBRING MECHANISM FOR BOATS.

APPLICATION FILED SEPT. 21. 1903.

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HOISTIN G AND LOWERING MECHANISM FOR BOATS. APPLIUATION 11.21) 52mm, 1903.

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No. 798,973. PATENTED SEPT. .5, 1905; 1?. s. PETT.

HOISTING AND LOWERING MECHANISM FOR BOATS.

APPLICATION FILED SEPT. 21. 1903.

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UNITED STAES PATENT OFFICE.

HOISTING AND LOWERING MECHANISM FOR BOATS.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed Septembez 21, 1903. Serial No. 174,112.

To a. H'lb/TIIL it may concern/.-

Be it known that I, FRANK SAMUEL Pn'r'r, master mariner, a subject of the King of Great Britain, residing at 11 Belgrave Gardens, Folkestone Road, Dover, in the county of Kent, England, have invented certain new and useful Improvements in Hoisting and Lowering Mechanism for Boats, of which the following is a specification.

This invention relates to certain improvements in boat lowering, suspending, and securing apparatus of the description referred to in the specification of British Patent granted to V. Andrews, No. 2.4%, dated February 17, .1887.

The object of my present improvements is to enable the boat to be readily and rapidly swung in and out and to have the rotary motion of the davits at all times under control; to provide the davits with a turning in and out apparatus that shall not be so liable to failure as those at present in use, and which shall be capable of rotating the davits simultaneously from the extreme of either position, in or out, whether the ship is upright or has a heavy list at the moment, by worm and worm-wheel mechanism or by hauling on one and slacking away on the fall of another tackle, or by other equivalent means; to enable the engaging and disengaging hooks in the boat to be placed at such distance from the ends that the weight and strain of the boat and crew are more evenly distributed over the stern, stern-post, and keel and to prevent the sagging of the boat between the points of suspension; to so design and place the davits as to bring the lower blocks of the davittackles more nearly under the upper blocks when the davits are in the fore-and-aft position and so reduce the strain on and facilitate the turning in and out of the boat; to provide means for rapidly securing the boat in either the out or in position by means of grips and spar.

The invention relates also to the use of rotary or swinging ships or like davits so constructed, angled, and spaced that one or both davits may be swung out or in direct from their previous or former position without possibility of the gunwale or ends of the boat coming into contact with the davits or their standards, whereby the davits can be so spaced beyond the ends of the boats that I am enabled to arrange the points of suspension in the boats that while the boat is being swung in or out one end at a time all risk of contact between the davits and any part of the boat is avoided,and this will be found fully illustrated, particularly in Figs. 1, 2, and 8 of the accompanying drawings.

The invention also relates to an improved construction and use of ships or like davits provided with turning or rotating mechanism so constructed, combined, and arranged that the worm and worm-wheel or other turning mechanism always maintain their correct operative positions irrespective of any spring in the davits, say, of boat-deck or other support or of any want of truth or sag due to the heel of the davit not being fully footed in standard or heel plate, and this will be found fully illustrated in Figs. 5 and 6 of the accompanying drawings.

Figure 1 is a side view of a boat, broken away for the convenience of the drawings, suspended from the davits by usual tackle, the davits being in their fore and aft positions and showing the angle the davit-tackles make with the perpendicular when in this position. Fig. 2 is a plan view of Fig. 1. The dotted lines indicate the position of the boat when swung out and the angle the davits make with the fore-and-aft line of the ship. Fig. 3 is a front view of the boats spar, supported by vertical hinged stanchions, the boats spar and davits being broken away for convenience of the drawings. boat with spar in section, showing the arrangement of grips and vertical pins for securing the ends of the grips, also belaying-pin for grip-tackle fall to belay to, Figs. 5, 6, and 7 are various views of davits, standard, worm, and worm-wheel mechanism, Figs. 5 and 6 being partly in section. Fig. 8 is a plan view of a boat. The davits as here shown are each provided with two fixed horizontal lever-arms for swinging the boat in or out in unison. Fig. 9 is a front view of a pair of davits and their standards attached to the spar-deck and a boat-deck above the latter. The worm-spindle in each case has secured to it a sprocket-wheel, these wheels being connected together by means of an endless chain, thus insuring simultaneous rotary motion of the davits.

Referring to Figs. 1 and 2, a a are the davits; 6 I), the standards for same on the shadedeck; a c, the tackles, and (l the boat. The standards I) b, as shown by Figs. 5, 6, and 7, are fitted with worm and worm-wheel mechanism, the worm-wheel a being secured to the Fig. a is an end view of a 7 davit a bymeans of' aikey e fixed to the davit (0, thus allowing the lower portion of the davit a to freely rest or bed in its footstep:

6* and the worm-wheel c to be adjusted so as always to correctly gear with the worm-f. The worm-wheel e is fitted with collars 0 which rest in bearings 6 provided in the standard 6 and the split cap I) of same. (See Fig. 7.) Rotary motion is obtained through the medium of the hand-wheel f and its connected gearing. The lower end of this standard Z) has a flange b and a collar 6 the latter passing through and the former beingbolted to the ships deck. The collar 72 is cut away, as shown in Fig. 6, forming a recess 6*, in which the davit-stop a works, the length of this recess 6* limiting the rotary movement of the davits a. In order to obtain simultaneous movement of the davits, Iattach to the spindle of each worm a sprocket-wheel it or.

in some cases it is attached to the davits direct. The sprocket-wheels in either case are connected together by an endless chain '10, as shown by Fig. 9. On the upper portion of the standard 6 is cast a half-collar b to receive and hold in position the end g of boat-spar g. To enable the boat-spargto be rapidly placed in position and to obtain the necessary support, the spar. g is provided with vertical stanchions 9*, (see Figs. 3 and 4,) thelower ends being hinged to brackets on the-deck, as shown. vided with projections 9 which when the spar is in the vertical position pass through the opening h in the half-collar 6 formed on the davit -standard-. b. (See Fig. 5.) A- pin 9 passing'throughthe projection g locks,- the spar in position. g represents pads on the spar ,gto securely rest the boat against.

Referring to Fig.- 4, the attachments on boatspar g, ships deck, and davits, to which. the grips it are secured, take the form of vertical pins h, with belaying-pin forged on collar: on the spar and 7& on the ships deck, the eyes:

if of the grips being automatically locked in position by the springs It. The grips are made in two pieces, the upper and lower gripv lfibeing connected and set taut by gun-tackle purchase it. end to engage with the horned or vertical pin attachments. as the boat remains suspended the grips remain on, but as soon as the loweringv of the boat commences the weight of the latter comes on the lower grips and they, being held in position only by the springs It, slip off and free the boat.

Fig. 8 shows attached to each of :the davits a two fixed horizontal lever-arms j j, coupled up by the necessary tackles for simultaneous swinging in or out of same. One set of tackle only can, be used at a time, it being removed from the one pair ofarms to the other for the inboard or outboard movement.

I have shown in Fig. 9 a boat-deck A above The ends 9 of the sparg arepro Eyes are formed on each grip I With thisarrangement so long the main or spar deck for the purpose of supportingthe boat when swung inboard by the is swung over a ships side onto the deck thereof.

2. A plurality of rotatabledavits having. means for supportinga boat, a hinged spar normally closing the space between the davits, means for securing. the spar to the davits and means for actuatingv the latter.

3. A plurality of davits for supporting a boat and a hinged spar for normally closing the space between the davits and sidewise movable independent of the same.

4. A plurality of rotatable davits having means for simultaneously actuating each thereof, means for limiting the movement of the davits, a hinged spar for normally closing the space between thedavits, adapted to moveinboard below the path of the boat, and means for automatically releasing the boat.

5. In a boat hoisting and lowering mechan ism, the combination of mechanism for supporting the boat'ahinged drop-down spar adapted to move inboard below the path of the boat supported by said mechanism as said boat is swungover a ships side onto the deck thereof, and means for securing the spar in a normal closed position.

6. In a boat hoisting and lowering mechanism, includinga plurality of spaced davits having meansfor supporting the boat, the combination of a hinged spar adapted to move inboard below the path of the boat, supported by the said means as said boat is swung over a ships deck onto the deck thereof.

7. Ina ship the combination of spaced davits supported in standards, a spar detachably connected to the standards and hinged to the ships deck.

8. In aship the combination of spaced davits, supported in standards, a spar detachably connected to the standards and having stanchions hinged to the ships deck.

9. In a ship the combination of spaced rotatable davits supported in standards, a hinged drop-down spar for normally closing the space between the standards, and means for detach-v ably connecting the same thereto.

10. In a ship, the combination of spaced ro.--

tatable davits supported in standards, said standards provided with sockets, a spar detachably connected to the sockets, stanchions carried by the spar. and hinged to the ships deck, and grips secured to the spar "for automatically releasing the boat.

IIO

11. In a ship, the combination of spaced rotatable davits supported in standards, mechanism for actuating the davits, a hinged spar detachably connected to the standards, and means for detachably connecting the spar to the standard.

12. In a ship, the combination of a plurality of spaced rotatable davits, mechanism for actuating each of the said davits and means for limiting the movement thereof, a hinged drop -down spar movable inboard for normally closing the space between the davits, and means for actuating simultaneously the said mechanism.

13. A plurality of movable davits for supporting a boat, a hinged drop-down spar having independent sidewise movement for normally closing the space between the davits, means for actuating the davits and means for limiting the movement thereof.

14:. A plurality of davits for supporting a boat, standards for the davits, a hinged spar for normally closing the space between the davits and detachably connected to the standards, and automatic means for releasing the boat when being lowered.

15. A plurality of spaced hollow standards, rotatable davits having gears mounted in said standards, means carried by the davits for supporting a boat, a spar normally closing the space between the davits and adapted for independent sidewise movement below the path of a boat as the same is swung over a ships side onto the deck thereof rotatable means within the standards for engaging the gears and means for actuating the same.

16. In a boat-hoisting means having fixed hollow standards, rotatable davits having a gear mounted in said standard, mechanism carried by the davits for supporting the boat means within the standard for engaging the said gear, and means coi'iperating therewith for imparting motion to the davit.

17. In a boat-hoisting means having hollow standards, the combination of davits having gears rotatably mounted therein, said standards provided with hearings on opposite sides of said gears, a worm-gear within the said standards for engaging the first-mentioned gears and hand-operable means exteriorly of the said standards for imparting motion to the davits.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

FRANK SAMUEL PEIT.

\Vitnesses:

HARRY OIIN} S'IOGDEN, ERNEST J. HILL. 

